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Home  /  Storage  /  HPE 3PAR Volumes, Chunklets, and LUNs (Part 1)
26 January 2016

HPE 3PAR Volumes, Chunklets, and LUNs (Part 1)

Storage 3PAR, Notes Leave a Comment
HPE 3PAR Volume Management
Source HPE 3PAR StoreServ Storage best practices guide
Source HPE 3PAR StoreServ Storage best practices guide

The 3PAR Operating System has a logical volume manager that provides virtual volume abstraction. Part 1 is a quick overview to explain the architecture at a high level and provide a basic introduction to the concepts. [Link to Part 2 when available]

Chunklets 1 GB chunklets of physical disks, treated like “mini” disks
Logical Disks chunklets from hundreds of drives form RAID sets
Volume Spaces user, snapshot, and admin spaces striped across logical disk regions
Virtual Volumes base or snapshot, full or thin provisioned, mapped to spaces
Virtual LUNs virtual volumes made visible to hosts as LUNs
Physical Disks

Every physical disk admitted into the 3PAR system is divided into 1 GB chunklets. A chunklet is the most basic component of data storage in the 3PAR Operating System. Chunklets are blocks of space and form the basis of the RAID sets.

Logical Disks

The logical disk layer is where RAID functionality occurs. A logical disk is a collection of chunklets arranged as stripes of a RAID set. Logical disks will consist of chunklets belonging to the same drive type (NL-SAS, FC, or SSD).

Common Provisioning Group

Common Provisioning Groups (CPG) define the logical disks’ characteristics, including RAID type and disk type for chunklet selection.

Virtual Volumes

Virtual Volumes create the data layer presented to host servers; in traditional terminology, virtual volumes are LUNs.

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